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| Research on the Aseismic Behavior of Long—span Composite Bridge with Stiff Girder and Tender Arch |
| WU Zai—xin1，HE Guo—jing2，LUO Shi—dong3，YAN Ai—guo3 |
| 1．Central South University，Changsha，Hunan 410083，China；2．Central South University of Forestry and Technology，Changsha，Hunan 410004，China；3．China Railway Siyuan Survey and Design Croup Co．Ltd，Wuhan，Hubei 430063，China |
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Abstract Research purposes: The Yichang Yangtze Bridge on the railway from Yichang to Wanzhou，is a long—span composite bridge with rigid frame and tender arch，with the main span of 275 m．By analysis of the dynamic response of the bridge under seismic action，this paper studies the dynamic and aseismic characteristics of such kind bridge to seek the weak points of aseismic behavior for paying attention to them in design．
Research conclusions: From the study and analysis of the aseismic behavior of a long—span composite bridge with rigid frame and tender arch，it is concluded that，compared with the traditional bridge，the aseismic behavior of a long—span composite bridge with rigid frame and tender arch is better，but the joint between pier and girder and the pier bottom are poor at aseismic behavior．We should pay more attention in design．Generaly speaking，the tender arch has a larger displacement response，though its inner force response is small．Thus the arch top needs to be restricted due to great amount of transverse movement in ease，this type of bridge is built in a high—intensity earthquake area．
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Received: 02 March 2009
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2009, Vol. 26 
